Jealousy??

So my bf of almost 5 years and I have decided we are ready for another baby.  Our daughter is almost 4. I had my birth control taken out in the begining of June and still nothing.  Didn't even have my first period (didn't have one due to BC) until August. We have tried and tried and keep trying but no luck,  
  Anymore I've become very jealous of all my friends who are coming out  that they are prego again.  Most of my friends are going on two and three kiddos. In fact my best friend just had her second and I was there for the birth.  I miss being pregnant,  the kicks,  hiccups and just all the little movements.  I just feel so wrong to be jealous of not being pregnant or having a little baby.